Improvement in cutter-bar for harvesters



UNITED STATES PATENT OFFICE.

1 grooves made in the same.

WILLIAM JAMES OXER, OF WILLIAMSPORT, INDIANA.

`IMPRO'VIlli/Illl'l`IN CUTTER-BAR FOR HARVESTRS.

Specification fowning part of Letters Patent No. 103,361, dated May 24, 1870.

' To all 'zu/wm it may concern:

V construction and general arrangement of a cutter-bar for harvesters, as will be hereinafter fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to. describe its con struction` and operation, referring to the annexed drawing, in whieh- Figure l is a plan view 'of the entire cutterbar. Fig. 2 is a bottom 'view of a portion of the same, and Fig. 3 is' a plan view of a portion of the under knives and Iingers or guards.

A represents the linger-bar, to which the fingers or guards B B are attached in any suitable manner. On the upper side of the guards B B a suitable distance from the Viinger-bar A, and running parallel with the same, is se- `cured a bar, C. This bar is secured by screws The sections D I), which form the under knife, are fastened to the bar C by rivets, the

points ofsaid sections passing under the points of the fingers B B or guards, in a groove or The lingers or guards B B, it will be seen, thus-extend only so far on the upper side of the sections or knives D D as is necessary to hold them in position on the same.

The screws a c, that hold the bar C to the tin gers or guards B B, pass entirely through the sections D D, said sections being for that purpose provided with a hole at the base, in

of the screws. By this means the rivets, when broken, may be taken out of the knife without removing the screws; and by removing said screws the lower knife may be taken out and ground, when so desired.

0n the upper side of the lower knife D is placed the sickle E, having at its base, on the under side, a bar, b, lwhich fits between the nger-bar A and the knife-bar C. The sickle E is of such size as to cover the under knives, when the crank is on its extreme stroke, so that the sections commence cutting in the center, and has its cut equally divided on the knives. Y

The sickle Eis held close to the lower knife D by means of spring shields I I, secured to the upper side of the finger-bar A by screws, so that they can be tightened at pleasure, and cause them to press the edges of the knives close together, so as to insure a true cuttingedge, and keep the machine from clogging or choking. The points of the shields I are provided with holes, so that the screws ct a may be removed without removing the shields.

Having thus fully described my invention,

what I claim as new and desire to secure by Letters Patent, is-

1. In combination with the sickle E, with its under projecting bar or enlargement iitting into the groove described, the shield-shaped springs I, provided with openings at their ends, and secured to the bar A, with their ends resting upon the sickle E, substantially` 

